New chromium complexes for ethylene oligomerization: Extended use of tridentate ligands in metal-catalyzed olefin polymerization
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- Authors:
- SMALL, Brooke L
CARNEY, Michael J
HOLMAN, Danah M
O'ROURKE, Colleen E
HALFEN, Jason A - Author Affiliations:
- Chevron Phillips Chemical Company, LP, 1862 Kingwood Drive, Kingwood, Texas 77339, United States
Department of Chemistry, University of Wisconsin-Eau Claire, 105 Garfield Avenue, Eau Claire, Wisconsin 54702, United States - Source:
- Macromolecules. 37(12):4375-4386
- Publication Date:
- 2004-01-01
- Language:
- English
- Abstract:
- A family of chromium complexes bearing tridentate pyridine-based ligands are disclosed as highly active precatalysts for the oligomerization of ethylene. The ligands are comprised of two distinct types: Type 1, in which both ketone groups of 2,6-diacetylpyridine are converted to imines to produce pyridine bisimine NNN ligands; and Type 2, in which only one ketone group of 2,6-diacetylpyridine is condensed with an aniline derivative to give monoimine NNO coordination sets. Ligands of either type are coordinated to chromium(II) or chromium(III) chlorides, and activation of the resultant complexes with methylaluminoxane (MAO) produces highly active ethylene oligomerization and polymerization catalysts. Catalysts of Type 1 (NNN set) generally produce 1-butene when only two ortho alkyl substituents are present but switch to making waxes or polyethylene when the size and/or number of ortho substituents are increased. Catalysts of Type 2 (NNO set) produce waxes and polyethylene under all of the substitution patterns studied. The butene-producing catalysts can make 1-butene with 99.5+% purity, and the wax-producing catalysts make highly linear to moderately branched waxes, depending on the presence of an α-olefin comonomer.
- Notes:
- Physical chemistry of polymers
- Subjects:
- Polymers, paint and wood industries
Polymères, industries des peintures et bois
Sciences exactes et technologie
Exact sciences and technology
Sciences appliquees
Applied sciences
Physicochimie des polymeres
Physicochemistry of polymers
Polymères organiques
Organic polymers
Préparation, cinétique, thermodynamique, mécanisme et catalyseurs
Preparation, kinetics, thermodynamics, mechanism and catalysts
Polymérisation
Polymerization
Oléfine polymère
Olefin polymer
Olefina polímero
Activité catalytique
Catalyst activity
Actividad catalítica
Base Schiff
Schiff base
Catalyseur complexe
Complex catalyst
Catalizador complejo
Chrome complexe
Chromium complex
Cromo complejo
Complexe chloro
Chloro complex
Complejo cloro
Coordinat tridenté
Tridentate ligand
Ligando tridentado
Ethylène polymère
Polyethylene
Etileno polímero
Etude expérimentale
Experimental study
Estudio experimental
Oligomérisation catalyseur complexe
Complex catalyst oligomerization
Oligomerización catalizador complejo
Paramètre cristallin
Lattice parameters
Parámetro cristalino
Polymérisation catalyseur complexe
Complex catalyst polymerization
Polimerización catalizador complejo
Pyridine dérivé
Pyridine derivatives
Piridina derivado
Structure cristalline
Crystalline structure
Estructura cristalina
Synthèse chimique
Chemical synthesis
Síntesis química
Aluminoxane(méthyl) - Format:
- Academic Journal
- Database:
- PASCAL Archive
- Journal:
- Macromolecules
- Volume:
- 37
- Issue:
- 12
- Page Start:
- 4375
- Page Count:
- 12
- ISSN:
- 00249297
- Publisher:
- Washington, DC: American Chemical Society, 2004.
- Document Type:
- Article
- Physical Description:
- print, 28 ref
